Flanged bobbin with snap on protected edge



Oct. 31, 1950 J. J. BLISS 2,527,519

FLANGE!) BOBBIN WITH SNAP ON PROTECTED EDGE Filed June 3, 1949 2 Sheets-Sheet 1 I WE I INVEN TOR. JEROME J. BLISS ATTO RN EYS Oct. 31, 1950 J. J. BLISS 2,527,519

FLANGED BOBBIN WITH SNAP ON PROTECTED EDGE Filed June 3, 1949 2 Sheets-Sheet 2 I I 'IIIIII INVENTOR. JEROME J. BLISS ATTORNEYS fiatentecl Oct.

UNITED STATES PATENT OFFICE FLANGED BoBBIN Wifiii sNAr N PROTECTED EDGE- Jerome J. Bliss, Minneapolis, Minn., assignor t6 Acrometal Products, Ina, Minneapolis, Minn, a corporation of Minnesota Application June 3, 1949, Serial No. 96,847

Claims. (Cl. 242118) iclosed in that application and in-the present application.

This application also discloses but does not (claim subject matter similar to that disclosedand iclaimed in my companion application entitled Tubular Snap Joint, Serial No. 96,848 file'd June f3, 1949.

The usual textile bobbin now employed includes ';a central wooden barrel on which the thread is wound and separate end flanges formed of fiber {and attached to the outer ends of the barrel. A ;-great many difficulties are experienced in the use (of such bobbins. The thread is wound on many (of these bobbins under high tension and the :thread exerts both high crushing tension on the barrel of the bobbin and end thrust against the {flanges of the bobbin. The wooden barrel, al-- athough originally accurately cylindrically formed, is not strong enough to continuously. resist the crushing strain imposed upon it and often quickly becomes misshapen and must be discarded for the reason that it will not run true and in proper balance at high speeds when so misshapen, and the roughness of the barrel, due to the imperfections in the shape thereof, often results in the tearing or cutting of strands of thread wound thereon.

Also, due to the end pressure exerted on the fiber;

bobbin flanges which are separate from the barrel, these flanges tend to bow outwardly and spread from the barrel, thereby producing crevices or cracks between the ends of the barrel and the flanges within which thread may be caught to become frayed or torn during the winding or unwinding operation. The bowing out of the bottom flanges also tends to cause thebobbin to run imperfectly as it is being rotated.

If, to give the bobbin adequate strength and t prevent the formation of thread catching cracks between the barrel and end flanges, there is substituted for the usual wooden barrel bobbin equipped with separate fiber end flanges a metal bobbin wherein metal end flanges are provided,

other difficulties result. In drawing off the thread from the bobbin the thread is often drawn off from one end of the bobbin and the thread thus rides against the peripheral edge of the end flange,.and if this end flange is nicked, marred, dented or cut so as to be otherwise than perfectly smooth, strands of the thread are liable to catch on the roughened portion of the end flange, causing. thetearing of oneor more strands of the .-thread.- If bobbins having unprotected metal end flanges are provided theseend flanges are subject to rapid deterioration through flicking, marring, denting or cutting during the handling of the bobbins, and thus bobbins having unprotected end flanges integral with the barrel portions are not a solution to the problem. 7

There is a disadvantage in employing cast bob- "bins' made of metal or plastic due to inaccuracies that will resultin the barrel and flanges in such cast bobbins. Also, if such cast bobbins are made from synthetic resins or other plastics, they do .not have sufficient strength to resist the tremen- I when. made of heavy material give rise to difiiculties in maintaining the bobbin in proper balance athigh speeds ,to greater extents than is the case when lighter bobbins are employed. 7

To overcome the various disadvantages in the ,bobbins now employed, and as disclosed in my firstapplication above referred to, I have devel- -.op'ed flanged bobbins having metal drum members forming barrels and flanges at the outer ends of the barrels, andlhave provided heads formed of tough, resilient, non-metallic material having the property of being shaped to form a smooth wedge incapable of, being-readily nicked, marred,

dented or cut, and I have provided these heads with recesses receiving the respective metal flang- ',;-es ,-;;the heads having circumferential portions overlying the edges of the flanges and being of smooth exterior formation, the inner sides of the circumferential portions of the heads lying flush with the inner sides of said flanges. In my above referred to'application, one method of attachment of such heads is by bonding the heads to the flanges by use of an adhesive such as an ad ,hesive made from synthetic resins.

-The present invention relates to such bobbin wherein heads are employed made of such a tough, elastic, non-metallic material that the heads at their circumferential portions may be curled inwardly and snapped over stepped edges of the metal flanges so as to interlock and hold the heads on to the flanges whether the heads are bonded to the flanges or secured thereto by other means.

It is accordingly an object of the invention to provide a light weight exceedingly strong flanged bobbin including a metallic drum member having a barrel portion and an outer flange, and a tough elastic head formed at its inner side to receive the metal flange, the edge of the flange being stepped and the head having a circumferential portion which will overlie the edge of the flange and interlock with the step thereof by snapping the head on to the flange, the material used for making the head being such that the outer peripheral edge of the head will form a smooth surface which cannot be readily nicked,

marred, dented or cut.

A further object is to provide such a bobbin wherein the flange of the drum member is formed of a single thick piece of metal or of two laminations spot welded or otherwise secured together.

Another object is to'provide such a bobbin wherein the head forms an interlocking collar for joining the barrel to a metal tube forming a continuation of the barrel.

The objects and advantages of the invention will more fully appear from the following description made in connection with the accompanying drawings wherein like reference characters refer to the same or similar parts throughout the difierent views, and in which Fig. l is a view partly in side elevation and partly in longitudinal section illustrating a bobbin embodying the invention;

Fig. 2 is a detail in enlarged scale showing portions of certain of theparts illustrated in Fig.

Fig. 3 is an exploded view in longitudinal section showing the parts of the bobbin illustrated in Figs. 1 and 2 as they will appear prior to assembly;

Fig. 4 is a view similar to Fig. 1 but illustrating a modified form of bobbin;

Fig. 5 is a detail in enlarged scale showing in vertical section the tubular joint between the drum member and the barrel tube;

Fig. 6 is a view similar to Fig. lbut showing a bobbin illustrating another modification of' the invention;

Fig. 7 is a view taken partly inside elevation and partly in vertical section illustrating another'form of bobbin embodying the invention;

Fig. 8 is a detail in section on enlargedscale showing portions of certain of the parts'ill'ustrated in Fig. '7;

Fig. 9 is an exploded view showing'the parts 'of the bobbin illustrated in Figs. 7 and 8 prior trated in Fig. 10.

Referring first to the form of the invention illustrated in Figs. 1; 2, and 3, there is there shown a bobbin A including a pair of drum members l2 made of metal and preferably a metal such as aluminum or aluminum alloy, a

4 pair of heads 13 formed of special non-metallic material, a pair of rings [4 formed of nonmetallic material and preferably of the same type as the heads [3, and a tubular core 15 formed of metal and preferably a light weight metal such as aluminum or aluminum alloy.

Each drum member 12 includes a heavy circular flange In and a barrel portion 12b which in the form of the invention illustrated is integrally formed with the flange, preferably of approximately half the thickness of the flange and projecting inwardly from the central portion of the flange [2a.

Each head [3 is formed of a tough, resilient, non-metallic material capable of being formed or shaped to provide a smooth tough edge which cannot be readily nicked, marred, dented or cut through rough handling. While this material must be resilient, its resistance to deformation must be such that it will retain its form and position without deformation under very heavy pressure. It is possible that other materials may be used for forming a head I3 than plastic Nylon, and, hence, I do not wish to be limited to the use of plastic Nylon alone for the purpose. However I have found that plastic Nylon is an ideal material for use in forming the heads l3, as this material has all the characteristics required. Each head [3 has an outer disc portion of somewhat greater diameter than the flange [2a to which the head is to be connected and it has an incurled circumferential portion l3a shaped to receive and overlie the edge of the flange I211 of the drum member to which the head is to be connected. The inner surface of the circumferential portion is shaped to lie flush with the inner surface of the flange 12a. The peripheral surface of the circumferential portion 13a is very smoothlyformed and is preferably rounded as shown so as to provide a smooth hard tough edge which cannot be readily nicked, marred, dented, or cut to catch on the strands of thread or wire which may run over this peripheral edge.

The internal surface of the incurled circumferential portion of the head [3 and the peripheral surface of the flange [2a are matingly formed to provide interlocking steps for holding the head -l3 assembled to its adjacent drum member 12. Thus considering the peripheral edge of the flange 12a from the outer side of the flange inwardly to the inner side thereof the peripheral edge of the flange'is first provided with a semicircular convex rib or step 520 and then inwardly from this rib or step the periphery of the flange is provided with a semicircular concavity or groove 1211 as best shown in Fig. 2. Inwardly from the 'groove 12d the periphery of the flange [2a is sidering' the internal surface of the incurled circumferential portion 13a of the head [3 inwardly from the disc portion of the head, this surface is provided with an outer concave groove [31) to 'ceived within said groove.

step or rib 130 the internal surface of the incurled circumferential portion of the head is receive the step or rib of the cooperating drum member. Inwalrdly from the groove I31) the internal surface of the curled in portion of the head is provided with a'convex step or rib [3c which mates with the groove l2d and is re- Inwardly from the ternal surface of the incurled circumferential portion of the headis provided with a cylindrical portion I3e which mates with and snugly receives the cylindrical portion I2) of the periphery. of the flange I2a. It should be stated that all of the various surfaces, I2c, I2d, 'I2e, I2), and I3b, [3a, I 3d and I3e are concentric relative to the longitudinal central axis of the head I3 and the drum member I 2.

When the head I3 -is concentrically aligne with its cooperating drum member I2 and heavy pressure is applied to bring the two parts together the curved rib I2 will first strike the truncated conical surface I3d of the head and the incurled circumferential portion I3a of the head will be cammed outwardly against the tough resistance ofiered by the said circumferential portion, causing the surface I3d and the rib I30 to ride over the rib. I3b.. Asthe rib or step I30 rides over the rib .or step I2c during the bringing of the two parts together, the circumferential portion I3a of the head. snaps inwardly carrying the rib 130 .into the groove l2d and the rib I2c into the tion and compression that a very strong interlock is obtained to tightly hold the two parts together with the flange I2a of the drum member received within the recess formed at the inner surface of the head in tight engagement. Also, the material of the head is put under sufiicient compression and frictionally grips the periphery of the flange I2a so tightly that it becomes impossible to rotate the head I3 relative to the drum member I 2 after the two parts are engaged.

Each head I3 is also provided with an inwardly extending cylindrical flange I3) which will project inwardly well beyond the inner edge of the barrel portion I2b of the drum member. The exterior surface of the inner portion of the cylindrical flange I3) is provided with one or more ribs or steps I3g (three in the form illustrated) and grooves I3h between th adjacent steps for interlockingengagement with steps or ribs Ia .and grooves I5b formed on the interior surface of the metal tube I5 adjacent the end thereof. These ribsor steps I3g and the mating ribs or steps I 5a and I5b formed inv the tube I5 are inclined as shown and rounded as shown to permit of the camming inwardly of the ribs I39 and the snapping into place of the steps I3g within the grooves I5b as the heads are assembled to the outer end portions of the tubular core I5.

Of course, both ends of the tubular core I5 are provided with the ribs and grooves I5a and I5b.

Interposed between the inner edge of the barrel portion I21) and the adjacent end of the tubular core I5 is a ring I4 which is also preferably made of plastic Nylon or a non-metallic, material which is tough and resilient. As the head I3 is brought into interlocking engagement with the tubular core I5 this ring I4 is compressed under heavy compression, and thus due to the tough resilient character of the material forming the ring- H it becomes impossible forthe joint to open up between the ring and the drum member I2 or. between the ring and the tubular core I5 even though there be some expansion or contraction of the parts after assembly.

The central portions of the heads I3 are bossed inwardly and apertured to provid tubular trunnions I32 for reception of a spindle on which the entire bobbin maybe mounted. Variations in the shape of this trunnion structure may be made to accommodate the bobbin to fitspindles of different types and shapes. =1 1 'In assembling the difierent parts of the bobbin together, all the parts are assembled atsonetime'. Suitable fixtures are provided for the two heads I3 and the drum members I2. The ring I4 and the tubular cores I5 having been concentrically aligned, the two heads I3 are forced toward each other under very high pressure. As thetwo heads move toward each other the incurled ,circum ferential portions I3a of the heads ar snapped on to the flanges I2a of the drum members l2, while at the same time the cylindrical flanges I3 of the heads are forced into and snap, intoengagement with the outer portions of the tubular core I5, the ring I4 being simultaneously, compressed.

It is usually desirable to anodyze theexterior surfaces of the metallic drum members I2 and of the tube I5. As the rings M are placed under compression as the parts are assembled, the ex terior surfaces of these rings project slightly out beyond the anodyzed surfaces of the adjacent parts and may be buffed ofl smoothly to align directly with the surfaces without forming any irregularities in the core portion of the bobbin. Also, if there are slight discrepancies between the thicknesses of the inner ends of the barrel. portions I2bof the drum members I2 and the outer ends of the tubular core I5 the rings I4 will take up for these variations.

When the bobbin has been assembled, it is of exceedingly strong construction and, of course, the tubular core member I5 forms an aligned continuation of the barrel portions I2b of the two drum members. This core portion ofthe bobbin has terrific strength to withstand the enormous pressures that will be exerted on thecore portion of the barrel a thread or wire is wound thereon or as the thread shrinks after wetting to set the twist made in the thread. By reason of the fact that the barrel portions I2b of the drum members I2 are made integral in the illus trated embodiment with the flanges I2a of the drum members it becomes impossible for the flanges I 2a. to pull away from the barrel portions I2b as the thread or wire wound on the drum exerts terrific pressures against the flanges and thus no cracks or crevices can develop. between the barrel portions I2b and the flanges I2a. for the catching of the thread or wire or strands thereof. The joint between the head and the tubular core member I5 is such that it will not pull out under the terrific pressures exerted against the bobbin flanges. The bobbin,zif-made of aluminum or aluminum alloy and plastic Nylon as is preferred, will be of comparatively lightweight structure relative to other bobbins, and this is of material advantage in bringing the bobbins up to speed and in maintainance of the static and dynamic balance of the bobbinswhen rotated at very high speed. The edges of the flanges of the bobbin will be protected by the heads I3 so that even though the bobbin is very roughly handled or is dropped on the floor, the

7; edges of the flanges cannot becomeroughened or dented or cut to cause the catching-f. the thread or strands thereof as it ridesover the .peripheraledges of one or both of'the heads 13. The Nylon trunnions I32 which are formed integral with the heads I3 are ideal for reception of the spindles.

Referring now to the bobbin shown in'Figs. 4. and .5, this bobbin is designated as an entirety by the letter B. This bobbin includes drum members I6, heads H and connecting collars t8, and a tubular core [9. The drum members Hi and the tubular cores I9 are preferably made of aluminum or aluminum alloy as in the case of the bobbin A, while the heads I1 and the connecting collars I8 are preferably made of a tough resilient non-metallic material of the same type as are the heads [3 and the rings M of thebobbin A. The peripheral edges of the flanges of the drum members l6 are provided with two truncated conical surfaces [6a and I62) with a radial surface 160 between these two surfaces, whereby the surface 16a forms a step or rib at the peripheral surfaces of the flange of the drum member. Similarly, each head IT is provided with an inwardly curled circumferential portion Ila, the central surface of which is stepped in complement to the peripheral edge of the flange of the drum member. With this arrangement it will be seen that the head l-l may be forced on to the flange of the drum member in much the same manner as in the previously described construction and the incurled circumferential portion Ha of the head will snap over th stepped peripheral edge of the flange of the drum member to interlock therewith.

Instead of equipping each head I! of the bobbin B with an inwardly projecting flange as in "the case of the bobbin A, no such flange is provided in the head ll. However, each head is provided with an inwardly projecting trunnion portion llb as in the previously described construction. Each collar I8 has a central exterior projecting flange (8a which will be received between the inner end of the barrel portion of the adjacent drum member and the outer end of the tubular core l-S and placed under compression as the drum members I'Bare assembled to the collars l8 and the collars 18 are assembled to the ends of the tubular core 19. At either side of the flange |8a the collarat its exterior surface is providedwith a step or rib I821 which will be received withincorrespondinggrooves ltd and iila formed at the adjacent end portions of the respective barrel portions'of the drum members and the end portions of the tubular core I 9.

Referring now to Fig. '6, there is there shown another alternative form of bobbin embodying the invention, this bobbin being designated by the'letter -C. The bobbin C is identical to the bobbin A previously described with the exception that the rings I 4 employed in the bobbin A are eliminated and the outer ends of the tubular 'cores are brought 'into direct engagement with the inner ends of the barrel portions of the drum members. 'The bobbin'C can be employed particularly when it is not desired to anodyze the exterior surfaces of the metal parts and, of course, this bobbin is of a cheaper construction than the :bobbinA'butJacks some of'the advantages of the :bobbin A.

:Referring now to' the form of the invention @shown in Figs. '7, 8, and 9, the bobbin there shown is designated by the letter D. This bobbin difiers principally from the bobbin previously de- "scribed/in that the flanges of the drum mem bers of the bobbinare of laminated construction andgthe' barrel portions of the drum members aremade of considerably greater length than are the barrel portions of the previously described drum members.

The bobbin D includes a pair of drum mem bers 20 preferably formed ,ofsheet metal such as aluminum or aluminum alloy and having long barrel portions 20a and flanges 20b outturned from'the outer ends of the barrel portions and integrally connected therewith. The material from which the drum members 20 are formed is relatively soft so that it can be easily drawn. Fitting-against the outer portions of the drum member 20 is a reinforcing disc or lamination}! having an inturned flange 2|a which is received within the outer part of the barrel portion 20a. The reinforcing disc 2| will preferably be made of hard heat treated aluminum or aluminum alloy having greater strength than the material forming the drum member 20, and, therefore, incapable of being drawn to the same extent aslis the drum member 20. The reinforcing disc 2! is secured to the flange 20b of the drum member as by two lines of spot or seam welds 22 and 23, one line being spaced inwardly from the outer edge of the flange 20d and the other line being spaced from but adjacent to the jointure of the flange 20b with the barrel portion 20a. Each head 24 is formed of the same material as that employed for making the other heads referred to and it has an inwardly curled circumferential portion 24a shaped and formed as in the case of the circumferential portion [3a of the bobbin A. The laminated flanges of the bobbin D produced by the flanges 20b and the disc 2| are shaped and formed at their peripheries as in the case of the periphery of the flange [2a of the bobbin A, and, of course, the head 24 is snapped over and interlocked with the laminated flange as in the case of the previously described constructions. The central portion of each head 24 forms a trunnion i lb which is recessed at its exterior side to receive a metal apertured cup member 25 of the type employed on certain types of bobbins.

The inner ends of the barrel portions 20a are interconnected by a collar 26 having on its exterior surface a central flange 26a which is received under compression between the two inner ends of the barrel portions 20a. Also, the collar 26 is provided at either side ofthe flange 26 :with a number of steps or ribs 26b which are received within grooves 280 formed at the interior sides of the end parts of the barrel portions 20a. The collars 26 are preferably made of the same type of non-metallic material as the heads 24.

Referring now to the bobbin E shown in Fig. 10, the heads 21 of this bobbin are shown as being formed quite similarly to the heads ll of the bobbin B with the exception that the heads are provided with outwardly extending hubs 21a and inwardly extending hubs 21b inwardly rabbetted to receive the ends of a strut-like tube 28 preferably made of metal and projecting between the two heads of the bobbin. The drum members 29 of the bobbin E are generally quite similar to the drum members 20 of the bobbin D and they are provided with laminated flanges formed by the flanges of the drum members and reinforcing discs 30 similar to the discs 2! previously described. The drum members 29 are secured to the reinforcing discs 30 by two lines of spot, or line welds 3| and'32, the welds 3! [being located inwardly from the peripheral edges of the flanges 29a of the drum members, and the flanges 30a of the reinforcing discs 30. The

vinner ends of the two drum members are interconnected by an exteriorly flanged collar 33 formed preferably of synthetic resins, fiber,or

metal and adhesively bonded to the inner parts of the barrel portions of the drum members by an adhesive 34 formed preferably of synthetic (resin.

It will be seen that highly efficient bobbin structures have been provided.

It will, of course, be understood that various changes may be made in the form, details,'arrangement, and proportions of the various parts without departure from the scope of the present invention, which, generallystated, consists in the matter shown, and described, and set forth in the appended claims.

What I claim is:

1. A flanged bobbin comprising a metal drum member having a tubular barrel portion and a circular flange, the peripheral edge of said flange being stepped, and a circular head formed of a tough, resilient non-metallic material, the circumferential portion of said head being curled inwardly and overlying the peripheral edge of said flange with the inner surface of said circumferential portion of the head lying flush with the inner side of said flange, the internal surface of the inwardly curled portion of said head being stepped in complement to the peripheral edge of said flange and the material from which said head is formed having sufficient resilienc that; the inwardly curled portion of the head-will snap over the periphery ofthe flange to interlock therewith as the :"headis forced onto the flange, the periphery of the circumferential portion of said head forminga smooth, tough edge which cannot be readily nicked, marred, dented or cut.

2. The structure defined in claim 1, said head 3. A flanged bobbin comprising ametal drum member having a tubular barrel portion and a circular flange, the peripheral edge of said flange being ribbed and grooved, and a circular. head formed of a tough, resilient, non-metallic ma terial, the circumferential portion of said head being inwardly curled and overlying the peripheral edge of said flange with the inner surface of said circumferential portion of the head lying flush with the inner side of said flange, the internal surface of the inwardly curled portion of said head being grooved and ribbed in comple-z ment to the peripheral edge of said flange, and an inner portion of the internal surfaceof the curled portion of said head being shaped to ride over therib of said flange causing the rib of said flange to cam said inwardly curled portion of the head outwardly as said drum member and head are forced together, thereby permitting the rib of said head to snap over the rib; of said flange to interlock therewith, the periphery of said head being formed to produce a smooth tough, edge, which cannot be readily nicked, marred, dented; or cut. a 4. A flanged bobbin comprising a metal drum member having a tubular barrel portionand a circular flange,-the peripheral edge of said flange from the outer sideof the flange to; the inner having a central trunnion portion formedithere- V 210 side thereof being provided with first a circumferential rib and then a circumferential groove, and a circular head formed of a tough,

resilient, non-metallic material, the circumferential portion of said head being curled inwardly and overlying the peripheral edge of said flange and the inner surface of the circumferential portion of the head lying flush with the inner side of said flange, the internal surface of the inwardly curled portion of the head being provided with a circumferential groove receiving said circumfer ential rib of the flange and being also provided inwardly from the groove formed therein with a circumferential rib received within the circumferential groove of the flange, the periphery of the circumferential portion of said head being smoothly formed to. provide a surface which cannot be readily nicked, marred, dented or cut. fan-The structure defined in claim 4, the inner portion of the rib of said head being sloped from adjacent the inner surface of said circumferential portion to ride over the rib of said flange as said head is forced on to said drum member causing the inwardly curled portion of said head to expand outwardly and the snap in place on said flange in interlocked relation therewith.

6. A flanged bobbin comprising a metal drum member having a tubular barrel portion and a circular flange, said flange projecting from the outer end of said barrel portion and the flange being considerably thicker than said barrel portion, the peripheral edge of said flange having an outer circumferential rib and a circumferential groove inwardly therefrom, and a circular head formed of a tough, resilient, non-metallic material, the circumferential portion of said head being curled inwardly and internally circumferentially grooved and ribbed to mate with the rib and groove at the peripheral edge of the flange, the circumferential portion of said head overlying the periphery ofthe flange andthe inner-surface of said circumferential portion lying flush with the innersurface of said flange, the periphfcry of said head being smoothly formed to form a surface which cannot be readily nicked, marred, dented or cut. v

7. A flanged bobbin comprising a metal drum member having a tubular barrel portion anda laminated circularflanga means fastening the laminations of said flange together, the peripheral edge of thelaminated flange being provided with a circumferential rib and a circumferential groove inwardly therefrom, and a circular head formed of a tough, resilient, non-metallic mater rial, said head having an inwardly curled cirsurface of the inwardly curled portion of said head having a circumferential groove and a circumferential rib respectively complementary with the riband grooveof said flange, the peripheryof the circumferential portion of the head being smoothly formed to provide an edge which cannot be readily nicked, marred, dented or cut. 8. The structure defined in claim 'l, the outer lamination of the flangeof said drum member having a n inturned flange received within the outer part'of said barrel portion.

9'. The structure defined in claim 8, the outer lamination of said flange being formedof a hardened metal which cannot be readily drawn,

and the i nner lamination of said flange and said barrel portion being formed of a softer metal which, can be readily drawn.

10. A flangedbobbin comprising ametal drum member having a tubular barrel portion and a circular flange which projects from the outer end of said barrel portion, a circular head formed of a tough, resilient, non-metallic material, the circumferential portion of saidhead overlying the periphery of said flange and the inner surface of said circumferential portion being flush with the inner surface of said flange, the periphery of said head being smoothly formed to provide a surface i which cannot be readily nicked, marred, dented or out, said head having a central cylindrical portion projecting through and inwardly from said tubular barrel portion, the exterior surface of said cylindrical portion inwardly from said barrel portion being circumferentially ribbed and grooved, and a tubular core member having its internal surface grooved and ribbed in complement to the ribbing and grooving of said cylindrical portion and matingly receiving the ribbed and grooved part of said cylindrical portion of said head.

11. The structure defined in claim 10, and a ring formed of tough, elastic material located between the inner end of said barrel portion and the outer end of said core member and placed under compression.

12. A flanged bobbin comprising a metal drum member having atubular barrel portion and a circular flange which projects from the outer end of said barrel portion, the peripheral edge of said flange being ribbed and grooved, a circular head formed of a tough, resilient, non-metallic material. the circumferentialportion of said head being curled inwardly and overlying the periphery'of said flange with the inner surface of said circumferential portion of the headlying flush with the inner side of said flange, the internal surface of said curled in portion of said head-being grooved and ribbed in complement to the ribbing and grooving of the peripheral edge of said flange to receive the same in interlocking relation therewith, the peripheral edge'of said head being smoothly formed to provide a surface which cannot be readily nicked, marred, dented or cut, 1

portion of said core member being internally circumferentially grooved and ribbed in complement to-the ribbing and grooving of said cylindrical portion to receive and interlock therewith.

13. The structure defined in claim 12 and a ring formed of tough, resilient, non-metallic material held under compression between the inner end of said barrel portion and the outer end of said core member. r

14. The structure defined in claim 12 and a spindle receiving trunnion formed by said head centrally of said cylindrical portion.

15. A flanged bobbin comprising a metal drum member having a tubular barrel portion and a circular flange projecting from the outer end of said barrel portion, the outer portion of the peripheral edge of said flange forming a circumferential rib, the intermediate portion of the peripheral edge of said flange forming a circumferential groove, the portion of said peripheral edge of said egsevwr-e 12 flange inwardly from said groove being of truncated conical shape with its larger base located toward the inner side of said flange, and the extreme inner portion of the peripheral edge of said flange being of cylindrical contour, the surface of which is radially spaced from the axial center of the flange the same distance as said rib,

and a circular head formed of a tough, resilient, non-metallic material, the circumferential portion of said head being curled inwardly and overlying the peripheral edge of said flange with the inner surface of said circumferential portion of the head lying flush with the inner side of said flange, the internal surface of the curled in portion of said head being complementary to the periphery of said flange and interlocking therewith, the periphery of said head being smoothly formed to provide a surface which cannot be readily nicked, marred, dented or cut, and a tubu- Iar metal core member joined tothe inner end of said barrel portion in alignment therewith.

16. The structure defined in claim 15, said head having a central cylindrical portion projecting inwardly through said tubular barrel portion and received within the outer part of said core member, the exterior surface of the inner part of said cylindrical portion and the internal surface of the outer part of said core member being ribbed and grooved in complement to form an interlocking connection.

17. A flanged bobbin comprising a metal drum member having a tubular barrel portion and a circular flange which projects from the outer end of said barrel portion, the peripheral edge of said flange being stepped, and a circular head formed of plastic Nylon, the circumferential portion of said head being curled inwardly and overlying the peripheral edge of said flange with the inner surface of said'circumferential portion of the head lying flush with the inner side of said flange, the internal surface of the-inwardly curled portion of said head bein'g stepped in complement to the peripheral edge of said'flange to interlock therewith, the peripheral edge of the circumferential portion of said head'forming a smooth edge.

18. A flanged bobbin comprising a drum member of aluminum alloy having a tubular barrel portion and a circular flange which projects from the outer end of. said barrel portion, the peripheral edge of said flange being stepped, and a circular head formed of plastic Nylon, the circumferential portion of said head being curled inwardly and overlying the peripheral edge of said flange with the inner surface of said circumferential portion of the head lying flush with the inner side of said flange, the internal surface of the inwardly curled portion of said head being stepped in complement to the peripheral edge of said flange to interlock therewith, the periphery of the circumferential portion of said head forming a smooth edge.

19. A flanged bobbin comprising a drum member of aluminum alloy having a tubular barrel portion and a circular flange which projects from the outer end of said barrel portion, the peripheral edge of said flange being stepped, and a circular head formed of plastic- Nylon, the circumferential portion of said head'being curled inwardly and overlying the peripheral edge of said flange with the inner surface of said circumferential portion of said head lying flush with the inner side of said flange, the internal surface of the inwardly curled' portion of said head being stepped in complement to and interlocking with the peripheral edge of said flange, theperiphery of the circumferential portion-of said head-forming a smooth edge, said head having a central inwardly projecting cylindrical portion projecting through said barrel portion and being stepped at its external side inwardly from said barrel portion and a tube formed of aluminum alloy Within the outer end of which the stepped portion of said cylindrical portion is received, the end portion of said tube being stepped in complement to the step of said cylindrical portion to interlock therewith.

20. The structure defined in claim 19, and a Nylon ring interposed in compressed relation between the inner end of said barrel portion and the outer end of said tube.

JEROME J. BLISS.

The following references are file of this patent:

UNITED STATES PATENTS Number Name Date Corey Aug. 11, 1885 Howsarn Oct. 11, 1932 Baker 1 May 15, 1934 

